dovecot - Mar 2012 - 2.1: timeout waiting for lock?

Mar 15 09:46:11 postamt dovecot: pop3(username): Error: Couldn't open INBOX:
Timeout while waiting for lock
Mar 15 09:46:11 postamt dovecot: pop3(username): Couldn't open INBOX
top=0/0, retr=0/0, del=0/0, size=0
Mar 15 09:47:26 postamt dovecot: pop3(username): Error: Couldn't open INBOX:
Timeout while waiting for lock
Mar 15 09:47:26 postamt dovecot: pop3(username): Couldn't open INBOX
top=0/0, retr=0/0, del=0/0, size=0
Mar 15 09:51:01 postamt dovecot: pop3(username): Error: Couldn't open INBOX:
Timeout while waiting for lock
Mar 15 09:51:01 postamt dovecot: pop3(username): Couldn't open INBOX
top=0/0, retr=0/0, del=0/0, size=0

during that time, I wasn't able to access the mailbox using imap. I
then issued

doveadm kick username

and all over sudden the mailbox was accessible (via IMAP)

# doveadm kick username
kicked connections from the following users:
username 

# /usr/local/scripts/find_abnormal_imap  
Mar 15 11:38:48 postamt dovecot: imap: Warning: Killed with signal 15 (by
pid=24545 uid=0 code=kill)

-- 
Ralf Hildebrandt
  Gesch?ftsbereich IT | Abteilung Netzwerk
  Charit? - Universit?tsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebrandt at charite.de | http://www.charite.de

On Thu, 2012-03-15 at 11:44 +0100, Ralf Hildebrandt
wrote:
> Mar 15 09:46:11 postamt dovecot: pop3(username): Error: Couldn't open
INBOX: Timeout while waiting for lock
> Mar 15 09:46:11 postamt dovecot: pop3(username): Couldn't open INBOX
top=0/0, retr=0/0, del=0/0, size=0
> 
> during that time, I wasn't able to access the mailbox using imap. I
> then issued
Maildir?
> doveadm kick username
> 
> and all over sudden the mailbox was accessible (via IMAP)
So one of them had the INBOX locked. Do you have pop3_lock_session=yes?